/*
 * ++Copyright++ 1985, 1989, 1993
 * -
 * Copyright (c) 1985, 1989, 1993
 *    The Regents of the University of California.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 * 	This product includes software developed by the University of
 * 	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * -
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 * 
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies, and that
 * the name of Digital Equipment Corporation not be used in advertising or
 * publicity pertaining to distribution of the document or software without
 * specific, written prior permission.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 * -
 * --Copyright--
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)res_init.c	8.1 (Berkeley) 6/7/93";
static char rcsid[] = "$Id: res_init.c,v 1.1.1.1.2.7 2004/07/03 19:04:25 syzop Exp $";
#endif /* LIBC_SCCS and not lint */

#include "struct.h"
#include "common.h"
#include "sys.h"
#include "res.h"
#include "numeric.h"
#include "h.h"
#include "inet.h"
#include <signal.h>
#ifndef _WIN32
#include <sys/time.h>
#include <sys/socket.h>
#else
#include <sys/timeb.h>
#endif
#include "nameser.h"
#include "resolv.h"
#include <string.h>
#ifndef IRC_RESCONF
#define IRC_RESCONF "/etc/resolv.conf"
#endif
/*-------------------------------------- info about "sortlist" --------------
 * Marc Majka		1994/04/16
 * Allan Nathanson	1994/10/29 (BIND 4.9.3.x)
 *
 * NetInfo resolver configuration directory support.
 *
 * Allow a NetInfo directory to be created in the hierarchy which
 * contains the same information as the resolver configuration file.
 *
 * - The local domain name is stored as the value of the "domain" property.
 * - The Internet address(es) of the name server(s) are stored as values
 *   of the "nameserver" property.
 * - The name server addresses are stored as values of the "nameserver"
 *   property.
 * - The search list for host-name lookup is stored as values of the
 *   "search" property.
 * - The sortlist comprised of IP address netmask pairs are stored as
 *   values of the "sortlist" property. The IP address and optional netmask
 *   should be seperated by a slash (/) or ampersand (&) character.
 * - Internal resolver variables can be set from the value of the "options"
 *   property.
 */
#if defined(NEXT)
#  define NI_PATH_RESCONF "/locations/resolver"
#  define NI_TIMEOUT 10
static int ircd_netinfo_res_init(int *haveenv, int *havesearch);
#endif

static void ircd_res_setoptions(char *, char *);

#ifdef RESOLVSORT
static const char sort_mask[] = "/&";
#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
#ifdef INET6
static u_int32_t ircd_net_mask(struct in_addr);
#else
static u_int32_t ircd_net_mask(struct in_addr);
#endif
#endif

#if !defined(isascii)		/* XXX - could be a function */
# define isascii(c) (!(c & 0200))
#endif

/*
 * Resolver state default settings.
 */

struct __res_state ircd_res
# if defined(__BIND_RES_TEXT)
= { RES_TIMEOUT, }		/* Motorola, et al. */
# endif
    ;

/*
 * Set up default settings.  If the configuration file exist, the values
 * there will have precedence.  Otherwise, the server address is set to
 * INADDR_ANY and the default domain name comes from the gethostname().
 *
 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 * since it was noted that INADDR_ANY actually meant ``the first interface
 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 * it had to be "up" in order for you to reach your own name server.  It
 * was later decided that since the recommended practice is to always 
 * install local static routes through 127.0.0.1 for all your network
 * interfaces, that we could solve this problem without a code change.
 *
 * The configuration file should always be used, since it is the only way
 * to specify a default domain.  If you are running a server on your local
 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 * in the configuration file.
 *
 * Copied WIN32 specific code from ircu NT port :p.
 *
 * Return 0 if completes successfully, -1 on error
 */

#ifdef _WIN32
extern OSVERSIONINFO VerInfo;
void get_res_from_reg_9x()
{
	register char *cp, **pp, *ap;
	register int n;
	HKEY hKey;
	char buf[BUFSIZ];
	int key_len = BUFSIZ;
	int key_type;
	ircd_res.nscount = 0;

	if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "System\\CurrentControlSet\\Services\\VxD\\MSTCP",
		0, KEY_QUERY_VALUE, &hKey) != ERROR_SUCCESS)
	{
		Debug((DEBUG_DNS, "Error: get_res_from_reg_9x: unable to open registry key"));
		return;
	}
	/* Retreive the Domain key */
	if (RegQueryValueEx(hKey, "Domain", 0, &key_type, buf, &key_len) != ERROR_SUCCESS)
	{
		Debug((DEBUG_DNS, "get_res_from_reg_9x: RegQueryValueEx: Domain failed"));
	}
	else
		strlcpy(ircd_res.defdname, buf, sizeof(ircd_res.defdname));
	key_len = BUFSIZ;

	/* Retreive the SearchList key */
	if (RegQueryValueEx(hKey, "SearchList", 0, &key_type, buf, &key_len) != ERROR_SUCCESS)
	{
		Debug((DEBUG_DNS, "get_res_from_reg_9x: RegQueryValueEx: SearchList failed"));
	}
	else
	{
		cp = ircd_res.defdname;
		pp = ircd_res.dnsrch;
		*pp++ = cp;
		for (n = 0; *cp && pp < ircd_res.dnsrch + MAXDNSRCH; cp++)
		{
			if (*cp == ',')
			{
				*cp = 0;
				n = 1;
			} 
			else if (n)
			{
				*pp++ = cp;
				n = 0;
			}
		}
		/* null terminate the last domain if there are excess */
		while (*cp && *cp != ',')
			++cp;
		*cp = 0;
		*pp++ = 0;
	}
	key_len = BUFSIZ;

	/* Retreive the NameServer key */
	if (RegQueryValueEx(hKey, "NameServer", 0, &key_type, buf, &key_len) != ERROR_SUCCESS)
	{
		Debug((DEBUG_DNS, "get_res_from_reg_9x: RegQueryValueEx: NameServer failed"));
	}
	else
	{
		struct in_addr a;
		cp = ap = buf;
		if (*buf != '\0')
		{
			do {
				n = 0;
				while (*cp && *cp != ',')
					++cp;
				if (*cp)
				{
					*cp = 0;
					n = 1;
				}
				if (inet_addr(ap) != INADDR_NONE)
				{
					ircd_res.nsaddr_list[ircd_res.nscount].sin_addr.s_addr = inet_addr(ap);
					ircd_res.nsaddr_list[ircd_res.nscount].sin_family = AF_INET;
					ircd_res.nsaddr_list[ircd_res.nscount].sin_port = htons(NAMESERVER_PORT);
					ircd_res.nscount++;
				}
				if (!n)
					break;
				ap = ++cp;
			} while (ircd_res.nscount <= MAXNS);
		}
	}
	RegCloseKey(hKey);
}

int get_res_nt(HKEY hKey, char *subkey, char *obuf, int *size)
{
	if (RegQueryValueEx(hKey, subkey, 0, NULL, obuf, size) != ERROR_SUCCESS)
	{
		*size = 0;
		return 0;
	}
	if (*size == 1)
	{
		*size = 0;
		return 0;
	}
	return 1;
}

int get_res_interfaces_nt(HKEY hKey, char *subkey, char *obuf, int *size)
{
	char buf[BUFSIZ];
	int key_len = BUFSIZ;
	int idx = 0;
	FILETIME lastwrite;
	HKEY hVal;
	while (RegEnumKeyEx(hKey, idx++, buf, &key_len, 0, NULL, NULL, &lastwrite) != ERROR_NO_MORE_ITEMS)
	{
		if (RegOpenKeyEx(hKey, buf, 0, KEY_QUERY_VALUE, &hVal) != ERROR_SUCCESS)
			continue;
		key_len = BUFSIZ;

		if (!get_res_nt(hVal, subkey, obuf, &key_len))
		{
			RegCloseKey(hVal);
			key_len = BUFSIZ;
			continue;
		}
		else
		{
			RegCloseKey(hVal);
			*size = key_len;
			return 1;
		}
		key_len = BUFSIZ;
	}
	*size = 0;
	return 0;
}

void get_res_from_reg_nt() 
{
	register char *cp, **pp, *ap;
	register int n;
	HKEY hKey, hInter;
	char buf[BUFSIZ];
	int key_len = BUFSIZ;
	ircd_res.nscount = 0;

	if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "System\\CurrentControlSet\\Services\\Tcpip\\Parameters",
		0, KEY_QUERY_VALUE, &hKey) != ERROR_SUCCESS)
	{
		Debug((DEBUG_DNS, "Error: get_res_from_reg_nt: unable to open registry key"));
		return;
	}
	RegOpenKeyEx(hKey, "Interfaces", 0, KEY_QUERY_VALUE|KEY_ENUMERATE_SUB_KEYS, &hInter);

	/* Retreive the Domain key */
	if (!get_res_nt(hKey, "Domain", buf, &key_len))
	{
		key_len = BUFSIZ;
		/* Try DHCP key */
		if (!get_res_nt(hKey, "DhcpDomain", buf, &key_len))
		{
			key_len = BUFSIZ;
			if (!get_res_interfaces_nt(hInter, "Domain", buf, &key_len))
			{
				key_len = BUFSIZ;
				if (!get_res_interfaces_nt(hInter, "DhcpDomain", buf, &key_len))
				{
					Debug((DEBUG_DNS, "get_res_from_reg_nt: RegQueryValueEx: Domain failed"));
				}
			}
		}
	}
	if (key_len > 0)
		strlcpy(ircd_res.defdname, buf, sizeof(ircd_res.defdname));

	/* Retreive the SearchList key */
	key_len = BUFSIZ;
	if (!get_res_nt(hKey, "SearchList", buf, &key_len))
	{
		key_len = BUFSIZ;
		/* Try DHCP key */
		if (!get_res_nt(hKey, "DhcpSearchList", buf, &key_len))
		{
			key_len = BUFSIZ;
			if (!get_res_interfaces_nt(hInter, "SearchList", buf, &key_len))
			{
				key_len = BUFSIZ;
				if (!get_res_interfaces_nt(hInter, "DhcpSearchList", buf, &key_len))
				{
					Debug((DEBUG_DNS, "get_res_from_reg_nt: RegQueryValueEx: SearchList failed"));
				}
			}
		}
	}
	if (key_len > 0)
	{
		/*
		 * Set search list to be blank-separated strings
		 * on rest of line.
		 */
		cp = ircd_res.defdname;
		pp = ircd_res.dnsrch;
		*pp++ = cp;
		for (n = 0; *cp && pp < ircd_res.dnsrch + MAXDNSRCH; cp++)
		{
			if (*cp == ' ' || *cp == '\t')
			{
				*cp = 0;
				n = 1;
			} else
			if (n)
			{
				*pp++ = cp;
				n = 0;
			}
		}
		/* null terminate the last domain if there are excess */
		while (*cp && *cp != ' ' && *cp != '\t')
			++cp;
		*cp = 0;
		*pp++ = 0;
	}	

	/* Retreive the NameServer key */
	key_len = BUFSIZ;
	if (!get_res_nt(hKey, "NameServer", buf, &key_len))
	{
		key_len = BUFSIZ;
		/* Try DHCP key */
		if (!get_res_nt(hKey, "DhcpNameServer", buf, &key_len))
		{
			key_len = BUFSIZ;
			if (!get_res_interfaces_nt(hInter, "NameServer", buf, &key_len))
			{
				key_len = BUFSIZ;
				if (!get_res_interfaces_nt(hInter, "DhcpNameServer", buf, &key_len))
				{
					Debug((DEBUG_DNS, "get_res_from_reg_nt: RegQueryValue: NameServer failed"));
				}
			}
		}
	}
	if (key_len > 0)
	{
		struct in_addr a;
		cp = ap = buf;
		if (*buf != '\0')
		{
			do {
				n = 0;
				while (*cp && *cp != ' ' && *cp != '\t' && *cp != ',')
					++cp;
				if (*cp)
				{
					*cp = 0;
					n = 1;
				}
				if (inet_addr(ap) != INADDR_NONE)
				{
					ircd_res.nsaddr_list[ircd_res.nscount].sin_addr.s_addr = inet_addr(ap);
					ircd_res.nsaddr_list[ircd_res.nscount].sin_family = AF_INET;
					ircd_res.nsaddr_list[ircd_res.nscount].sin_port = htons(NAMESERVER_PORT);
					ircd_res.nscount++;
				}
				if (!n)
					break;
				ap = ++cp;
			} while (ircd_res.nscount <= MAXNS);
		}
	}
	RegCloseKey(hInter);
	RegCloseKey(hKey);
}
#endif

int ircd_res_init(void)
{
	static int initialized = 0;
#ifndef _WIN32
	register FILE *fp;
#endif
	register char *cp, **pp;
	register int n;
	char buf[MAXDNAME];
	int  nserv = 0;		/* number of nameserver records read from file */
	int  haveenv = 0;
	int  havesearch = 0;
#ifdef RESOLVSORT
	int  nsort = 0;
	char *net;
#endif
#ifndef RFC1535
	int  dots;
#endif

	/* If already initialized, do nothing... */
	if (initialized)
		return 0;
	initialized = 1;

	/*
	 * These three fields used to be statically initialized.  This made
	 * it hard to use this code in a shared library.  It is necessary,
	 * now that we're doing dynamic initialization here, that we preserve
	 * the old semantics: if an application modifies one of these three
	 * fields of _res before res_init() is called, res_init() will not
	 * alter them.  Of course, if an application is setting them to
	 * _zero_ before calling res_init(), hoping to override what used
	 * to be the static default, we can't detect it and unexpected results
	 * will follow.  Zero for any of these fields would make no sense,
	 * so one can safely assume that the applications were already getting
	 * unexpected results.
	 *
	 * _res.options is tricky since some apps were known to diddle the bits
	 * before res_init() was first called. We can't replicate that semantic
	 * with dynamic initialization (they may have turned bits off that are
	 * set in RES_DEFAULT).  Our solution is to declare such applications
	 * "broken".  They could fool us by setting RES_INIT but none do (yet).
	 */
	if (!ircd_res.retrans)
		ircd_res.retrans = RES_TIMEOUT;
	if (!ircd_res.retry)
		ircd_res.retry = 4;
	if (!(ircd_res.options & RES_INIT))
		ircd_res.options = RES_DEFAULT;

	/*
	 * This one used to initialize implicitly to zero, so unless the app
	 * has set it to something in particular, we can randomize it now.
	 */
	if (!ircd_res.id)
		ircd_res.id = ircd_res_randomid();

/*ifdef INET6 not, because of IPv4 DNS serving */
#ifdef USELOOPBACK
	ircd_res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
#else
	ircd_res.nsaddr.sin_addr.s_addr = INADDR_ANY;
#endif
	ircd_res.nsaddr.sin_family = AF_INET;
	ircd_res.nsaddr.sin_port = htons(NAMESERVER_PORT);
	ircd_res.nscount = 1;
	ircd_res.ndots = 1;
	ircd_res.pfcode = 0;

	/* Allow user to override the local domain definition */
	if ((cp = getenv("LOCALDOMAIN")) != NULL)
	{
		strncpyzt(ircd_res.defdname, cp, sizeof(ircd_res.defdname));
		haveenv++;

		/*
		 * Set search list to be blank-separated strings
		 * from rest of env value.  Permits users of LOCALDOMAIN
		 * to still have a search list, and anyone to set the
		 * one that they want to use as an individual (even more
		 * important now that the rfc1535 stuff restricts searches)
		 */
		cp = ircd_res.defdname;
		pp = ircd_res.dnsrch;
		*pp++ = cp;
		for (n = 0; *cp && pp < ircd_res.dnsrch + MAXDNSRCH; cp++)
		{
			if (*cp == '\n')	/* silly backwards compat */
				break;
			else if (*cp == ' ' || *cp == '\t')
			{
				*cp = 0;
				n = 1;
			}
			else if (n)
			{
				*pp++ = cp;
				n = 0;
				havesearch = 1;
			}
		}
		/* null terminate last domain if there are excess */
		while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
			cp++;
		*cp = '\0';
		*pp++ = 0;
	}

#ifndef _WIN32
#define	MATCH(line, name) \
	(!strncmp(line, name, sizeof(name) - 1) && \
	(line[sizeof(name) - 1] == ' ' || \
	 line[sizeof(name) - 1] == '\t'))

#ifdef	NEXT
	if (ircd_netinfo_res_init(&haveenv, &havesearch) == 0)
#endif
		if ((fp = fopen(IRC_RESCONF, "r")) != NULL)
		{
			/* read the config file */
			while (fgets(buf, sizeof(buf), fp) != NULL)
			{
				/* skip comments */
				if (*buf == ';' || *buf == '#')
					continue;
				/* read default domain name */
				if (MATCH(buf, "domain"))
				{
					if (haveenv)	/* skip if have from environ */
						continue;
					cp = buf + sizeof("domain") - 1;
					while (*cp == ' ' || *cp == '\t')
						cp++;
					if ((*cp == '\0') || (*cp == '\n'))
						continue;
					strncpyzt(ircd_res.defdname, cp,
					    sizeof(ircd_res.defdname));
					if ((cp =
					    strpbrk(ircd_res.defdname,
					    " \t\n")) != NULL)
						*cp = '\0';
					havesearch = 0;
					continue;
				}
				/* set search list */
				if (MATCH(buf, "search"))
				{
					if (haveenv)	/* skip if have from environ */
						continue;
					cp = buf + sizeof("search") - 1;
					while (*cp == ' ' || *cp == '\t')
						cp++;
					if ((*cp == '\0') || (*cp == '\n'))
						continue;
					strncpyzt(ircd_res.defdname, cp,
					    sizeof(ircd_res.defdname));
					if ((cp =
					    strchr(ircd_res.defdname,
					    '\n')) != NULL)
						*cp = '\0';
					/*
					 * Set search list to be blank-separated strings
					 * on rest of line.
					 */
					cp = ircd_res.defdname;
					pp = ircd_res.dnsrch;
					*pp++ = cp;
					for (n = 0;
					    *cp
					    && pp < ircd_res.dnsrch + MAXDNSRCH;
					    cp++)
					{
						if (*cp == ' ' || *cp == '\t')
						{
							*cp = 0;
							n = 1;
						}
						else if (n)
						{
							*pp++ = cp;
							n = 0;
						}
					}
					/* null terminate last domain if there are excess */
					while (*cp != '\0' && *cp != ' '
					    && *cp != '\t')
						cp++;
					*cp = '\0';
					*pp++ = 0;
					havesearch = 1;
					continue;
				}
				/* read nameservers to query */
				if (MATCH(buf, "nameserver") && nserv < MAXNS)
				{
					struct in_addr a;

					cp = buf + sizeof("nameserver") - 1;
					while (*cp == ' ' || *cp == '\t')
						cp++;
					if ((*cp != '\0') && (*cp != '\n')
					    && inet_aton(cp, &a))
					{
						ircd_res.nsaddr_list[nserv].
						    sin_addr = a;
						ircd_res.nsaddr_list[nserv].
						    sin_family = AF_INET;
						ircd_res.nsaddr_list[nserv].
						    sin_port =
						    htons(NAMESERVER_PORT);
						nserv++;
					}
					continue;
				}
#ifdef RESOLVSORT
				if (MATCH(buf, "sortlist"))
				{
					struct in_addr a;

					cp = buf + sizeof("sortlist") - 1;
					while (nsort < MAXRESOLVSORT)
					{
						while (*cp == ' '
						    || *cp == '\t')
							cp++;
						if (*cp == '\0' || *cp == '\n'
						    || *cp == ';')
							break;
						net = cp;
						while (*cp && !ISSORTMASK(*cp)
						    && *cp != ';'
						    && isascii(*cp)
						    && !isspace(*cp))
							cp++;
						n = *cp;
						*cp = 0;
						if (inetaton(net, &a))
						{
							ircd_res.
							    sort_list[nsort].
							    addr = a;
							if (ISSORTMASK(n))
							{
								*cp++ = n;
								net = cp;
								while (*cp
								    && *cp !=
								    ';'
								    &&
								    isascii(*cp)
								    &&
								    !isspace
								    (*cp))
									cp++;
								n = *cp;
								*cp = 0;
								if (inetaton
								    (net, &a))
								{
									ircd_res.
									    sort_list
									    [nsort].
									    mask
									    =
									    a.
									    s_addr;
								}
								else
								{
									ircd_res.
									    sort_list
									    [nsort].
									    mask
									    =
									    ircd_net_mask
									    (ircd_res.
									    sort_list
									    [nsort].
									    addr);
								}
							}
							else
							{
								ircd_res.
								    sort_list
								    [nsort].
								    mask =
								    ircd_net_mask
								    (ircd_res.
								    sort_list
								    [nsort].
								    addr);
							}
							nsort++;
						}
						*cp = n;
					}
					continue;
				}
#endif
				if (MATCH(buf, "options"))
				{
					ircd_res_setoptions(buf +
					    sizeof("options") - 1, "conf");
					continue;
				}
			}
			if (nserv > 1)
				ircd_res.nscount = nserv;
#ifdef RESOLVSORT
			ircd_res.nsort = nsort;
#endif
			(void)fclose(fp);
		}
#else /* WIN32-specific code follows: */
	if (VerInfo.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
		get_res_from_reg_9x();
	else if (VerInfo.dwPlatformId == VER_PLATFORM_WIN32_NT)
		get_res_from_reg_nt();
	
#endif /* WIN32 */

	if (ircd_res.defdname[0] == 0 &&
	    gethostname(buf, sizeof(ircd_res.defdname) - 1) == 0 &&
	    (cp = strchr(buf, '.')) != NULL)
		strlcpy(ircd_res.defdname, cp + 1, sizeof ircd_res.defdname);

	/* find components of local domain that might be searched */
	if (havesearch == 0)
	{
		pp = ircd_res.dnsrch;
		*pp++ = ircd_res.defdname;
		*pp = NULL;

#ifndef RFC1535
		dots = 0;
		for (cp = ircd_res.defdname; *cp; cp++)
			dots += (*cp == '.');

		cp = ircd_res.defdname;
		while (pp < ircd_res.dnsrch + MAXDFLSRCH)
		{
			if (dots < LOCALDOMAINPARTS)
				break;
			cp = strchr(cp, '.') + 1;	/* we know there is one */
			*pp++ = cp;
			dots--;
		}
		*pp = NULL;
#ifdef DEBUGMODE
		Debug((DEBUG_DNS, ";; res_init()... default dnsrch list:"));
		for (pp = ircd_res.dnsrch; *pp; pp++)
		{
				Debug((DEBUG_DNS, ";;\t%s", *pp));
		}
		Debug((DEBUG_DNS, ";;\t..END..\n"));
#endif /* DEBUG */
#endif /* !RFC1535 */
	}

	if ((cp = getenv("RES_OPTIONS")) != NULL)
		ircd_res_setoptions(cp, "env");
	ircd_res.options |= RES_INIT;

#ifdef DEBUGMODE
	{
		int i;
		Debug((DEBUG_DNS, "res_init: %d nameserver(s):", ircd_res.nscount));
		for (i=0; i < ircd_res.nscount; i++)
			Debug((DEBUG_DNS, "%d. %s", i, inet_ntoa(ircd_res.nsaddr_list[i].sin_addr)));
	}
#endif
	return (0);
}

static void ircd_res_setoptions(char *options, char *source)
{
	char *cp = options;
	int  i;

#ifdef DEBUGMODE
	Debug((DEBUG_DNS, ";; ircd_res_setoptions(\"%s\", \"%s\")...",
		    options, source));
#endif
	while (*cp)
	{
		/* skip leading and inner runs of spaces */
		while (*cp == ' ' || *cp == '\t')
			cp++;
		/* search for and process individual options */
		if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1))
		{
			i = atoi(cp + sizeof("ndots:") - 1);
			if (i <= RES_MAXNDOTS)
				ircd_res.ndots = i;
			else
				ircd_res.ndots = RES_MAXNDOTS;
#ifdef DEBUGMODE
			Debug((DEBUG_DNS, ";;\tndots=%d", ircd_res.ndots));
#endif
		}
		else if (!strncmp(cp, "debug", sizeof("debug") - 1))
		{
#ifdef DEBUGMODE
				Debug((DEBUG_DNS,
				    ";; ircd_res_setoptions(\"%s\", \"%s\")..",
				    options, source));
				ircd_res.options |= RES_DEBUG;
#endif
		}
		else if (!strncmp(cp, "inet6", sizeof("inet6") - 1))
		{
			ircd_res.options |= RES_USE_INET6;
		}
		else
		{
			/* XXX - print a warning here? */
		}
		/* skip to next run of spaces */
		while (*cp && *cp != ' ' && *cp != '\t')
			cp++;
	}
}

#ifdef RESOLVSORT
/* XXX - should really support CIDR which means explicit masks always. */
static u_int32_t ircd_net_mask(struct in_addr in)	/* XXX - should really use system's version of this */
{
	register u_int32_t i = ntohl(in.s_addr);

	if (IN_CLASSA(i))
		return (htonl(IN_CLASSA_NET));
	else if (IN_CLASSB(i))
		return (htonl(IN_CLASSB_NET));
	return (htonl(IN_CLASSC_NET));
}
#endif

#ifdef	NEXT
static int ircd_netinfo_res_init(int *haveenv, int *havesearch)
{
	register int n;
	void *domain, *parent;
	ni_id dir;
	ni_status status;
	ni_namelist nl;
	int  nserv = 0;
#ifdef RESOLVSORT
	int  nsort = 0;
#endif

	status = ni_open(NULL, ".", &domain);
	if (status == NI_OK)
	{
		ni_setreadtimeout(domain, NI_TIMEOUT);
		ni_setabort(domain, 1);

		/* climb the NetInfo hierarchy to find a resolver directory */
		while (status == NI_OK)
		{
			status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
			if (status == NI_OK)
			{
				/* found a resolver directory */

				if (*haveenv == 0)
				{
					/* get the default domain name */
					status =
					    ni_lookupprop(domain, &dir,
					    "domain", &nl);
					if (status == NI_OK
					    && nl.ni_namelist_len > 0)
					{
						(void)strncpy(ircd_res.defdname,
						    nl.ni_namelist_val[0],
						    sizeof(ircd_res.defdname) -
						    1);
						ircd_res.
						    defdname[sizeof(ircd_res.
						    defdname) - 1] = '\0';
						ni_namelist_free(&nl);
						*havesearch = 0;
					}

					/* get search list */
					status =
					    ni_lookupprop(domain, &dir,
					    "search", &nl);
					if (status == NI_OK
					    && nl.ni_namelist_len > 0)
					{
						(void)strncpy(ircd_res.defdname,
						    nl.ni_namelist_val[0],
						    sizeof(ircd_res.defdname) -
						    1);
						ircd_res.
						    defdname[sizeof(ircd_res.
						    defdname) - 1] = '\0';
						/* copy  */
						for (n = 0;
						    n < nl.ni_namelist_len
						    && n < MAXDNSRCH; n++)
						{
							/* duplicate up to MAXDNSRCH servers */
							char *cp =
							    nl.
							    ni_namelist_val[n];
							ircd_res.dnsrch[n] =
							    strcpy((char *)
							    malloc(strlen(cp) +
							    1), cp);
						}
						ni_namelist_free(&nl);
						*havesearch = 1;
					}
				}

				/* get list of nameservers */
				status =
				    ni_lookupprop(domain, &dir, "nameserver",
				    &nl);
				if (status == NI_OK && nl.ni_namelist_len > 0)
				{
					/* copy up to MAXNS servers */
					for (n = 0;
					    n < nl.ni_namelist_len
					    && nserv < MAXNS; n++)
					{
						struct in_addr a;

						if (inetaton(nl.
						    ni_namelist_val[n], &a))
						{
							ircd_res.
							    nsaddr_list[nserv].
							    sin_addr = a;
							ircd_res.
							    nsaddr_list[nserv].
							    sin_family =
							    AF_INET;
							ircd_res.
							    nsaddr_list[nserv].
							    sin_port =
							    htons
							    (NAMESERVER_PORT);
							nserv++;
						}
					}
					ni_namelist_free(&nl);
				}

				if (nserv > 1)
					ircd_res.nscount = nserv;

#ifdef RESOLVSORT
				/* get sort order */
				status =
				    ni_lookupprop(domain, &dir, "sortlist",
				    &nl);
				if (status == NI_OK && nl.ni_namelist_len > 0)
				{

					/* copy up to MAXRESOLVSORT address/netmask pairs */
					for (n = 0;
					    n < nl.ni_namelist_len
					    && nsort < MAXRESOLVSORT; n++)
					{
						char ch;
						char *cp;
						const char *sp;
						struct in_addr a;

						cp = NULL;
						for (sp = sort_mask; *sp; sp++)
						{
							char *cp1;
							cp1 =
							    strchr(nl.
							    ni_namelist_val[n],
							    *sp);
							if (cp && cp1)
								cp = (cp <
								    cp1) ? cp :
								    cp1;
							else if (cp1)
								cp = cp1;
						}
						if (cp != NULL)
						{
							ch = *cp;
							*cp = '\0';
							break;
						}
						if (inetaton(nl.
						    ni_namelist_val[n], &a))
						{
							ircd_res.
							    sort_list[nsort].
							    addr = a;
							if (*cp
							    && ISSORTMASK(ch))
							{
								*cp++ = ch;
								if (inetaton(cp,
								    &a))
								{
									ircd_res.
									    sort_list
									    [nsort].
									    mask
									    =
									    a.
									    s_addr;
								}
								else
								{
									ircd_res.
									    sort_list
									    [nsort].
									    mask
									    =
									    ircd_net_mask
									    (ircd_res.
									    sort_list
									    [nsort].
									    addr);
								}
							}
							else
							{
								ircd_res.
								    sort_list
								    [nsort].
								    mask =
								    ircd_net_mask
								    (ircd_res.
								    sort_list
								    [nsort].
								    addr);
							}
							nsort++;
						}
					}
					ni_namelist_free(&nl);
				}

				ircd_res.nsort = nsort;
#endif

				/* get resolver options */
				status =
				    ni_lookupprop(domain, &dir, "options", &nl);
				if (status == NI_OK && nl.ni_namelist_len > 0)
				{
					ircd_res_setoptions(nl.
					    ni_namelist_val[0], "conf");
					ni_namelist_free(&nl);
				}

				ni_free(domain);
				return (1);	/* using DNS configuration from NetInfo */
			}

			status = ni_open(domain, "..", &parent);
			ni_free(domain);
			if (status == NI_OK)
				domain = parent;
		}
	}
	return (0);		/* if not using DNS configuration from NetInfo */
}
#endif /* NEXT */

u_int ircd_res_randomid()
{
#ifndef _WIN32
	struct timeval now;
	gettimeofday(&now, NULL);
	return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
#else
	struct _timeb now;
	_ftime(&now);
	return (0xffff & (now.time ^ now.millitm ^ getpid()));
#endif
}
